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y in (-oo:+oo)
(5/8)*y+1/2 = 11/2 // - 11/2
(5/8)*y+1/2-(11/2) = 0
(5/8)*y+1/2-11/2 = 0
5/8*y-5 = 0 // + 5
5/8*y = 5 // : 5/8
y = 5/5/8
y = 8
y = 8
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